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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '510a8db9b7f2ffaeae68a5a11c01b90bcd1459944ef21c681fe35392805225e2' 
  AND token = '2/gpKVG1aIKXCrmrhdWq85TaDwJYcIUzD37+AkSusrk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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