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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '12d9d7cc65b34c11b84dcf9976819ae11f26ffd14fde0cf8473f664abe0fc78d' 
  AND token = 'S94vcH+WH8eonc4i8sk63Aa+2Ab9Y83wQ2iWakzhmhM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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