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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b9f83bd7b998e75cf08d4ebcc0304446bcb72349a16cabaf845c64cc406d682' 
  AND token = 'QZ81sN4vgJI5hMUzEUY1NGTrZMJ5HSpQ29bvUQm3kXE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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