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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eceef18614d4a819c9780f02594ff7c8ad234bc5eaa402e775d04769f4eb8f46' 
  AND token = '9vi4XybR9tE8iAUiV69m8wcaTjdiiKke8kQvZswnwsk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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