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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04d1d7830f52997c0cbd97e9191596e736d73c60dc9a8ce5d707287c856c21cd' 
  AND token = '7qnVk8MqXf9Zul1tlnjUxLTbcq4Ls31QrhSssbVTZuY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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