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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '099014b642eec034f3057c8c0a6352d0690a0f29b7c352bec9087db4a72afd01' 
  AND token = 'mn9FrZ5BaCZhSBsY675srj4bt3smkmf+SLGoa9jUkgM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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