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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '079ea708d190900faa620cf246d9db907a99a32ce8d6237623ae131888d32173' 
  AND token = 'RnDcmbF/JbBQcIjJ4nKLZn8utOEVg6Sbay4oO5NwKWE=' 
  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"
    }
  }
}