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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fdbb02b306b08a5057e7ea90cdb88d1f9e83b087cffb5896653e27e5582513f5' 
  AND token = 'gg6dvpbcJ2V8TBzUM8YgDi2pnDKDqJ5f4gBwXiF+KEE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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