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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97af54618aecc52c82b1200bd0caf4332c0adcc1df4a01a7bfa2b6532f2b0eed' 
  AND token = 'til+zefT8C58c3LUKKEgeneeOCs9EFxICAuFqSt+/7I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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