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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5bfbee00b97ec37d9efb4865f2eda2a6bbfa29837d3a88eb4917685061c3d64a' 
  AND token = 'MttGd+pl8JkmBaI0RQutPIh53hGg1jf9eP2spgBZTxA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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