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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a65078c7a7baca77c3b10fbfe1b08f374d0aca0def22973b78d6ae35c3df1155' 
  AND token = '+u7oU7kBTnApgZc0nhK50F4gi77PiWlCgEdeq+Dv+gU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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