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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da75f9671706b8a1c054e1f9197553035856c611c978f3ad059fcbc0f70b3b13' 
  AND token = 'JWkE/sBsHNLA6VAI21LEfi6v/4XLv9oAraoZJC3UE6s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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