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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68798e3bc636cc57730c7092c4068bf9bba3b7c560a7ad1b54a2e419426bc0d6' 
  AND token = 'H32GFaHdDqu9jep63tPcsVjiX9C+XGHf5iy/fIo58Z8=' 
  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"
    }
  }
}