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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9137002e154a7202417701f3e06ece2996a4c39e3f6049643370a5c68817b0a5' 
  AND token = 'TT0gVoyDWCyu6GZB1WE7GBaksmFhoxQ+j6krPHLvn3Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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