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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '510a3c274cca8ccf3a2ebf17efca663e7e9c0f5c9427b4e00dff747045e39d08' 
  AND token = '5en9gfDOmjPgUtQSa3y1RGIAxFfLlIDgwN2K7oIN6NU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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