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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '265c2cf4d59ddd2931a3f9ad76ece0e4dbfd61edfa8403c4fada9879c38a8130' 
  AND token = '4BJl1Z4N8T4WfidysjmBOXynZEL93UGGNuXbXoHW5uU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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