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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '041e1aa2dd42e25ff090cbd1e975551fa6f145a6805276b3d9dcf3be7190fd25' 
  AND token = 'ClzPV2Pu8u0V4JCipDCL79ODsTt7dR8fCBlNctbO8UI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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