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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '498b53b32da8643782b3886c033db702196786cdc4c0debb7ba15b5a04814cf7' 
  AND token = 'Y3KA0rcaXODeH9MjtOwzd8n3e4y0uzX1jeC3Mq0npvI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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