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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce70a82e91d63773896d50d12e1d635bb64cc59e527527e9ddd6d7d28c74b5df' 
  AND token = 'mrMYdHvKoEW9+HZOhz74osybzHAmsVYs+4K59r8PjiU=' 
  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"
    }
  }
}