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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '25f79ff885cbaaf4494b1f56c8f35ccc53b2cebfa4dc0173065036fb04d93c9f' 
  AND token = 'ojB7z6gA795agTH/XgOXJAqENeQR5CH+dXs8W89/Lh0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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