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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07def8deff7202c78d3464393b20d8f1f29b70baee1607ae70165450c0432266' 
  AND token = 'PVmayd+iQ7qhxLK51rtccVEOfA+9R0cdVZiQO5ygS+Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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