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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed32485ed5c8db15612c6076b7ca801d34c9d5ca9c59e1b24e78dec14df4f22d' 
  AND token = 's+vdytEPA3pQ1D9qvF1KFMaSpgRZborZl3mJmTYZbEY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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