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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '042493f1a29b66313e513781957d847d1baac8a5df6857dac7e38d3e1b0346e4' 
  AND token = 'XZ5qQMwT091r/g28kyg6Z2P9ln3xnsuzOXNQYNWbiLU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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