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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '602239e2aa052f73bc6c0b77cd6f5f368eb43fd5c9f0874f70d9983620ed4270' 
  AND token = 'MW3DXSN3Kw7k7ZA7FHYxGF46lLG1xXUaJ54OEH0rVco=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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