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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8cf328aef66584b1b2eec8f2243d438560117da3e221706ff72b27a2fa9aec6b' 
  AND token = 'GgSsPkRVeFogiCwEqs3Gcs4Hd5DXJcDK8VaNRHX2B4o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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