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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f7ef56a36e587ac2cfa29a0ac33d98a0599c8fcc0aea2e919fbe6e7a05b55ad' 
  AND token = 'NHsoNb2eXAp7rAaxBB1q1OvyDsP59Bi7bPhm852ID68=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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