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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '43e097bb1ad3b927c94f0439823b9d3713456cfc87b790a95ea63d9e99e803e1' 
  AND token = 'ZDKQaNzSfhMLz1RpSKx/wR7S25lj0TeHnDftanKOQTQ=' 
  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"
    }
  }
}