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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19a25a51c413fd316034d32362d0f67a959dcbd5889aacd6c4cbb4b760ffcf7c' 
  AND token = 'oTV1Pj2bpOo9NSULLUXa69a/Gz++akC9HiULiXe+f/0=' 
  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"
    }
  }
}