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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f14cd7e5a3e03681ece638b7599913e768a1bf37164359a9bdaf99b31e446854' 
  AND token = 'PVLQA6z3DHHsJ0PFC6EOnAuF1SYFEUH7YayXWDG+e10=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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