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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97859376d625d3eeb2c696c1ebdf05205f2bafee4e59891f7909421b8cb76809' 
  AND token = '1oaxcxt2U/anNpJlanMQsiPrTeboC2zpfemib3zreAU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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