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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '59fd5a9a035bbca657354f1c93ac44708c95f1d79d64ddd0f4693c49ef0cf1f8' 
  AND token = '8WTAbLGpF48ruaf33iJp0CCNWgMJ7FfWX81TuyZoYTM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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