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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1b8aad023f7e53e0df309b5b97d4bd52283e79c12d0cb47c8938f317f11e417' 
  AND token = 'BF5F6dOHF7Aya0E4H6SZC2jj9+kCZuyfSuBym5GaNOA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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