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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2b16b0dde06258704c9872522152b4f8693f57e583008e815ddf63148e5fa25' 
  AND token = 'ywSzq3M5QB8H7u/teJKaEsEr567Xc5a4wR2n7CMk2Cw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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