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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3521c8f4069a535dc8fe0c44a76cc4943a5bf37444dde0cf76dc173fb24ae499' 
  AND token = 'VdoBF7mxsDpf1Q4HcoFyigQ3qr8hfBrc1XArkcdyNb4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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