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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '027d245fef274962f694822e7c8bea2f39b680b663e95a12401690f3855c9c1c' 
  AND token = 'uxM3tzv3DUclEzZFFavhRCnU5NM9tdj3Ht+51F8Boo8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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