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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '839d23f60eca8a3eedc3e9a9670221fec517a98a9629a3aa088e7f13969d9179' 
  AND token = '9gxJC5p1bh4esb1Px+akuf7Rhk0844O+0TGt99L/3VM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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