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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fde59f2cf2f82e5a06d76b6068fa6a2c482b68824d16fd3394f0478a666e4bb1' 
  AND token = 'ntrjvZGe0sO6NLNAyBp9DxjSndP3RBDyIUeXXYBBAM4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

JSON explain

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