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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99b13d881499f36bbe3e088f9562ae77b8e72110e16e2713650015d2e4f312f1' 
  AND token = 'pr4uLTWU2uAtjsaA2j2IOn0wN881R+fq9Oqj4qV2X4Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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