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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19895688241145fb8e1e9b1b3b5e61cbfb92f782867e507e2d362bf313c6d940' 
  AND token = 'FQJJuiyaBo+lI3h8SIYxJN7UJ15DL2qT4DU9McPP1gE=' 
  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"
    }
  }
}