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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb7b3a901c40b1e09a3724bded74a81075bddfd3263c1c3edd7eb73402688384' 
  AND token = 'pWfz6s3jW9Ps7M1SVlpt6rfTpcblVBJzrKQHI9IjoIs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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