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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6fdb7193ee96ab13327da61c8a50baaa409f0c3b25eae5a64fd09072a446482e' 
  AND token = 'kWYnJ3DjFklL/WutRAU4CrOBiMQAlB1qN+IVFMdBCKc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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