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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00eeadf907bc2f575b97f41687df55eae40ab585dc28bddd7f642572f4964da6' 
  AND token = '0sJZN2uz5r8Hk9Q7XbC40RxcWc5ZPNRnw8Uay1sxCyo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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