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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'baf999da7823cdc065cc3b9447efd102a00d4581efd4578b7e3de874e4f70c59' 
  AND token = 'W+tm8lJaTHoTKEuuMJJAezvUXBNaqc6zb2L48fFKoxg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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