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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '413ab188c933f2964a9d91f3cf86e05c7d7059052c4d900093af57787e116775' 
  AND token = 'QXXBoC/51fz9P4IoVaM4H3LCrmwtRPueehlUpG9w1Zc=' 
  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"
    }
  }
}