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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c183bce7d2903719abdb2826bb663c0886fc4bcbedaabe24dc4da5ab469ec0d' 
  AND token = 'WIRqcA4jUQ7Y3aOBf/XT89cQliehJxu2NXaqXc1wN3o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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