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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7abae3d0f4314ff196a3f1e011e3f91744d80d99eeb188c1d633a437963ad4ea' 
  AND token = 'CNxQuu9vyefHdVEmIdvZ4jtOf3ekDzlwMxZpxd7H/vU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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