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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3d55d2003604f9f6e8b945300daf92acef5ae5a2daa76949e8f0820af38fa02' 
  AND token = '++gcL4Jjbkh8r2w17IfwiTETzsQpY1EYyX05RMFzwCU=' 
  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"
    }
  }
}