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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32faf9517c66d5965a0a811614851205a0e14744f41d6a1f5539bea0d6eb71ab' 
  AND token = 'wvrhVcV6WVGN47CPFqvnitNcV9HYMq42OfpBWlchExY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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