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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fbcc8f87bd50faa0e7296021d19839f7a057adb0f46b5eed655768d993eacbda' 
  AND token = 'TDsIjus604fmJU//lQmxN/1J/II6mlN/CY5TXe7iM38=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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