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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6880e216f36c05e9b17337d96157ff36c8d0586c06bedea50ad38189df2dafe8' 
  AND token = 'TK6Cfy6OX9Dx7+Nvn/ciEO3THWND9+Rp4ulMq5qY5U4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00062

JSON explain

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