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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0af2caf06970dc609ce7521eee4252ccab0979a3c4aeb47be4fce431bede2ca' 
  AND token = 'PF5m2pI31kXABZkHJdvIiVLwci8YPZRB5a62XYka62Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}